Positron 9000

The Positron 9000 is a British made computer from 1982 and there is one in existence at https://binarydinosaurs.co.uk/.

This is a Level II system using the Motorola 6829 MMU and 2 KB pages. It has the entire kernel and several utility programs stored in 40 KB of ROM, and can therefore start up without a floppy disk.